Latch



' (Model.)

G. W. NooK.-

Latch.

No. 243,077. Patented June 231881;

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UNITED STATES PATENT OFFICE.

GEORGE' W. NOGK, OF PHILADELPHIA, PENNSYLVANIA.

LATCH.

SPECIFICATION forming part of Letters Patent No. 243,077, dated June 21, 1881.

Application filed April 2, 1881. (Model.)

To all whom it may concern:

Be it known that I, GEORGE W. NooK, of the city and county of Philadelphia, and State of Pennsylvania, have invented an Improvement in Locks, of which the following is a specication.

My invention relates to locks for doors, Snc.; and it consists in the construction and arrangement of two or more notched slides and their auxiliary mechanism,in combination with a cylinder to contain said slides, provided with two slots diametrically opposite a casing to contain said cylinder, and adapted to allow of its rotation or oscillation, and a pin secured to the casing and passing through the slots in the cylinder carrying the slides, the notches of which work with pin in withdrawing the bolt, and other mechanism to act upon and manipulate the bolt through the agency of the slidecylinder, all of which is more fully set forth in the following specification, and shown in the accompanying drawings.

The object of my invention is to simplify the lock, rendering it less expensive to produce and more compact and secure in its action.

In the drawings, Figure lis a plan view of my improved lock with the top plate and casing removed. Fig. 2 is a section of same on line x, showing top plate and casin g in place. Fig. 3 is a perspective view of the cylinder with its slides as removed from the lock. Fig. 4 is a perspective view of the slides and guide-plate and their springs. Figs. 5 and 6 are two crosssections of the lock on line y y, and show the ltwo positions of the cylinder and its slides in relation to the pin and casing when the lock is shut and when open.

A is the body ofthe1ock,B is the latch-bolt,l and O is the supplemental locking-bolt to secure the bolt in or out. A

yA is the cylindrical casing, and is secured to or forms part of the top plate of the lock.

'Vorking in this casing A is the lock proper,

D, which consists of the cylinder E, open at the bottom, and provided with a working pin or extension, E', which fits into a hole in the lock-case, and provided at the top with a slot, G, for the insertion of the key. (Shown in Fig. 3.)

Secured to the casin g A and passin gthrough slots ein the cylinder, is a pin, F; and situated within the cylinder, above and below said pin, are guide-plates K and K.

Located on either side of the guide-plate, and separated by the same, are the slide-plates J J provided with notches M and N. The latter notches-viz., N-are blinds, and prevent the picking of the lock without considerable skill, time, and trouble. These platesJ J are pressed up against the top of the cylinder, which is partly closed, by two springs, L, supported and carried by pin I, forming part of the .cylinder E. Also, secured to or forming part of the cylinder E is .the arm or projection H, which works against a pin on the latch-bolt B to draw it back against the pressure of a spring.

The operation is as follows: Insert the key into the slot G. The different steps of said key press down the slide-plates J J to the required depth, compressing the springs L until the notches M in said plates register with the pin F. This is governed by so arranging the steps inthe key that the key will be brought to rest by the bottom of the slot Gr just as-the notches and pin register. Then the key is turned, which action turns the cylinder from the position shown in Fig. 5 to position shown in Fig. 6, in which the casing A' and pin F are shown to be stationary, and the cylinder and its accessories D alone rotate. This is cifected by the separation between the two guide-plates K K and the notches M in slide-plates J J being on a line with the pin F and the slots c, and as the cylinder and its plates rotate, the pin F enters the notches, as shown in Fig. 6. The rotation of the cylinder draws back the latch-bolt B by means of the arm H. In locking it the pressure is taken oft' the key, and the spring of the bolt causes it to rotate, until the notches are free from pin F, when the springs L force them up and the key is removed; and when in this position the slides bear the relation to the pin as shown in Figs. 3 and 4, in which the solid part of the slides J J press against the pin and will not `allow the .cylinder to be rotated.

By simply changing the slides J J the combination of the lock can be altered without much expense, as the slides are changeable from one lock to another.

'Ioo

Having now described -niy invention, what I claim as new, and desire to secure by Letters Paten t, is-

1. In a lock, the combination of casing A', secured to the body of the lock, cylindervE, adapted to rotate therein, provided with slots e and G, pin F, slides J J', provided with notches M, and springs L, or their equivalent, as and for the purpose speeied.

2. In a'lock, the combination of casing A', cylinder E, provided with slots e and G, arm H, and pin I, or its equivalent, bolt B, pin F, slides J J', provided With notches M, and springs L, or their equivalent, as and for the purpose specified.

In a lock, the casing A', secured to the body of the lock, in combination with cylinder E, provided with the slots e, and pin F, secured to the casing, and allowing the cylinder to be rotated or oscllated, but not reciprocated, as shown and described.

4. In alock, the combination of sliding plates J J', provided with notches M, guide-plates K K', and pin F, substantially as and for the purpose specified.

5. In alock,the combination ofsliding plates J J', provided with notches U, guide-plates K K', pin F, cylinder E, casing A', and springs L, substantially as and for the purpose specified. In testimony of which invent-ion I hereunto Set my hand.

GEORGE W'. NOCK. Witnesses: *e

R. A. CAVIN, SAMUEL E. OAVIN. 

